The largest-ever hydrogen bomb blast has been shown in declassified Russian video that sparkedWorld War 3 fears during the Cold War. Tsar Bomba was the most powerful nuclear weapon ever built and tested, with more than 3000 times the power of the Hiroshima bomb. Documentary footage labelled "Top Secret" of the test explosion was released by Russian nuclear energy agency Rosatom in connection with the 75th anniversary of the military nuclear industry.

In the video, the explosion was accompanied by an extremely strong bright flash.

At that time, the carrier aircraft was 45km from the release point.

The flash was then followed by a red-orange glow.

Despite the cloudiness of the day, this was reportedly visible in a radius of up to 1,000km.

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At the site of impact, a dust and dirt column could be seen rising from the ground, quickly increasing in size.

A few seconds after the explosion, the diameter of the dust column was about 10km.

A fire dome from the hot explosion was also visible from the plane located 250km from the detonation point.

In the footage, the bright white light can be seen rising slowly, increasing in volume.

The maximum diameter of the dome reached 20km.

Around 40 seconds after the blast, the dome of fire reached an altitude of 30km.

The clean hydrogen bomb was detonated on October 30, 1961 in accordance with the test program for new samples of hydrogen charges.

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The hydrogen charge was developed by a large team of scientists and designers, and manufactured at the enterprises of the Ministry.

For testing, the charge was placed in an aircraft bomb case capable of holding charges with a yield of 100 megatrons or more.

The explosion was planned to be carried out at a high altitude above the ground using a launch aircraft.

Simultaneously with the preparation of the product, there was the preparation of the TU-95, a long-range heavy bomber, capable of carrying a bomb weighing 26 tons.

To determine the heat and shock pulse, measuring instruments were installed on the aircraft.

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Russia releases top-secret video of terrifying nuclear bomb that sparked World War 3 panic - Daily Express